1)(1+(3/5)+1,8)*(1/2)=(1,8+1,8)*(1/2)=1,8
2)(6-(4+8/15)):2,2=1+(3/15):2,2=1,2:2,2=12/22=6/11
3)(1,25+1/6)*2,4=(1+(1/4)+1/6)*2,4=(1+(10/24))*(24/10)=(24/10)+1=2,4+1=3,4
4)(5,4-(2+1/3):(7+2/3)=
(27/5-7/3):(23/3)= (27/5-7/3)*(3/23)=27*3/(5*23)-(7/23)=27*3-35/(5*23)=46/(5*23)=2/5
5)(2+(1/3)+(1/4))*0,12=(2+7/12)*0,12=(31/12)*12/100=31/100=0,31
6)(7,6-4,75):1,9=2,85:1,9=285:190=1,5